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x in (-oo:+oo)
(-2/5)*x-1 = -7/10 // + -7/10
(-2/5)*x-(-7/10)-1 = 0
(-2/5)*x+7/10-1 = 0
-2/5*x-3/10 = 0 // + 3/10
-2/5*x = 3/10 // : -2/5
x = 3/10/(-2/5)
x = -3/4
x = -3/4
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